Textured silicon carbide whisker toughened alumina-based ceramic, preparation method and application thereof

A technology for texturing silicon carbide and silicon carbide whiskers, which is applied in the field of composite gradient ceramic materials, can solve the problems of limiting high-speed cutting performance, inability to effectively increase thermal conductivity, and low thermal conductivity of alumina tools, and achieve high The effect of stability, high production efficiency, and less processing steps

Active Publication Date: 2020-12-15
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, whisker toughening tools have been widely used, but due to the low thermal conductivity of alumina tools, the whiskers used for toughening cannot effectively increase the thermal conductivity when they are randomly arranged in the sintered body, and the high-speed cutting temperature is very high , thus limiting its high-speed cutting performance

Method used

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  • Textured silicon carbide whisker toughened alumina-based ceramic, preparation method and application thereof
  • Textured silicon carbide whisker toughened alumina-based ceramic, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] 1. Preparation

[0036] (1) Alumina powder (purity 99.99%), silicon carbide whiskers, sintering aid Y with a volume ratio of 60:55:5 2 o 3 (purity 99.99%) for batching, using ethanol as a solvent, alumina balls as a ball milling medium, and a rotating speed of 200r / min, performing roller ball milling and mixing for 10 hours, and drying to obtain a mixed powder;

[0037] (2) Disperse the mixed powder in hot paraffin, and pour it into a mold (80mm in outer diameter, 75mm in height, and the ratio of outer diameter to inner diameter is 1.6) while it is hot, and cast it into a cylindrical casting;

[0038] (3) Apply an axial pressure of 90 MPa to the casting at room temperature, and the casting deforms along the center under high pressure to form a textured extrusion with radially arranged whiskers.

[0039] (4) Debinding the textured extruded part at 250°C under normal pressure to completely volatilize the paraffin to obtain a green body;

[0040] (5) Put the green body ...

Embodiment 2

[0051] The difference from Example 1 is that the axial pressurization described in step (5) is 20MPa,

[0052] The micromorphology of the alumina ceramic obtained in this example shows that the whiskers on the surface perpendicular to the pressing direction are basically arranged radially, and the relative density is 98.5%. The Vickers hardness on the surface is 20GPa, and the Vickers hardness at the center of the chord section is 19GPa.

Embodiment 3

[0054] The difference from Example 1 is that: the axial pressure in step (5) is 50 MPa, the sintering temperature is 1500° C.; the holding time is 50 min.

[0055] The micromorphology of the alumina ceramics obtained in this embodiment shows that the whiskers on the surface perpendicular to the pressing direction are basically arranged radially, and the relative density is 98%. The Vickers hardness on the surface in the compressive direction is 21GPa, and the Vickers hardness on the center of the chord section is 20GPa.

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Abstract

The invention belongs to the field of composite gradient ceramics, and discloses textured silicon carbide whisker toughened alumina-based ceramic, a preparation method and application thereof. The alumina-based ceramic is prepared by the following steps of: taking alumina, silicon carbide whiskers and a sintering aid MgO or Y2O3 as the raw materials, and adopting paraffin as a structural aid, mixing the raw materials to obtain mixed powder, dispersing the mixed powder into liquid hot paraffin, performing casting and cooling to obtain a casting, extruding the casting at normal temperature to realize texturing, and removing paraffin at high temperature to obtain a green body, and axially pressurizing the green body to 20-50MPa, performing heating to 1500-1800DEG C, and conducting sintering.According to the method, preparation of the textured alumina-based ceramic with the silicon carbide whiskers arranged in the radial direction is achieved, the textured alumina-based ceramic has high abrasion resistance and heat conductivity on a friction surface, the cutting temperature can be reduced when heat-resisting alloy and high-hardness metal materials are machined at a high speed, and thetextured alumina-based ceramic has higher stability, compared with common ceramic cutters in the market, the ceramic cutter made of the textured silicon carbide whisker toughened alumina-based ceramic has obvious application advantages.

Description

technical field [0001] The invention belongs to the technical field of composite gradient ceramic materials, and more specifically relates to a textured silicon carbide whisker-toughened alumina-based ceramic and a preparation method and application thereof. Background technique [0002] The development of modern cutting technology is bound to move towards high speed, precision and automation, which puts forward higher requirements for the performance of cutting tools. The development of ceramic cutting tools can reduce the use of rare resources, improve processing efficiency, and achieve high-speed, efficient and green processing. [0003] At present, the mainstream ceramic tool system can be divided into two categories: alumina-based and silicon nitride-based. Among them, the research on alumina-based ceramic tools is the earliest, the relevant theory is relatively mature, and the raw materials are abundant in nature. After several generations of improvement, alumina-base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/10C04B35/622C04B35/638C04B35/645
CPCC04B35/10C04B35/622C04B35/638C04B35/645C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/666C04B2235/96B28B3/025C04B35/80C04B35/117C04B2235/5244C04B2235/5276C04B2235/3217C04B2235/3206C04B2235/3224C04B35/6264C04B2235/6021C04B2235/77C04B2235/75C04B35/6261C04B2235/5436C04B2235/5445C04B2235/94C04B2235/95C04B2235/6022
Inventor 周宇章谭大旺郭伟明林华泰
Owner GUANGDONG UNIV OF TECH
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